The investigations on “Management of bollworm complex of cotton under High Density Planting System” was carried out at research farm, Department of Agricultural Entomology, VNMKV, Parbhani during Kharif 2012-2013. The NH-61 cotton variety was used for the study. The management of bollworms studies indicated that the spinosad 45 SC @ 200 g/ ha and emamectin benzoate 5 SG @ 200 g a / ha were most effective treatments for management of bollworm complex and that chemicals were safer for natural enemies like lady bird beetle and green lacewing and seed cotton yield also higher in these treatments. The effect of insecticides on seer cotton yield treatment Spinosad @ 200 ml/ ha (1248.30 kg/ha) and emamectin benzoate @ 200 g/ha (1157.90 kg/ha) recorded higher yield followed by navaluron @1000 ml/ha (1038.90 kg/ha), acephate @1000 ml/ha (880.28 kg/ha), profenophos @ 1000 ml/ha (834.72 kg/ha) and significantly lower cotton seed yield recorded in thiodicarb @ 1000 g (735.87 kg/ha). On the basis economics it was revealed that treatment with a emamectin benzoate had highest B:C ratio of 1:27.39.